If you see a little red circle in your sidebar next to the email button, it means that one of your senders is disconnected. If you are using this sender in your campaign, it will not be able to send new emails.
Troubleshoot #2: Check your campaign scheduling settings.
If all days remains unchecked, the campaign will send emails during any part of the day (as they come). But sometimes, people play with the scheduling settings and forget about it. It can be a reason why your emails are not being sent continuously throughout the week.
Published on: 14 / 12 / 2017